Nothing
SPCline<-function(){
instruct<-"Click the mouse on the top of the graph where the vertical line should begin. Repeat at the bottom of the graph for where the line should end. "
l<-locator(1)
l1<-locator(1)
# check<-l$y > l1$y
# swap=l1$y
# if(check==TRUE) {l1$y=l$y;l$y=swap}
segments(x0=l$x,y0=l$y,y1=rep(l$y:l1$y))
u<-readline("accept line? (y/n) ")
if (u=="n")
{replayPlot(ab)}
ab<-NULL
ab<<-recordPlot()
}
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